Incandescent lamp.



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H. GERNSBAGK.

INOANDESGENT LAMP.

APPLICATION FILED MAR. 12, 1907.

902,069. Patented 0011.27, 1908.

2 SHEETS-QEBET 2.

UNITED STATES PATENT OFFICE. HUGO GERNSBAOK, OF NEW YORK, N. Y., ASSIGNOR, MESNE ASSIQNMENTS, TO THE MOTOR GAR EQUIPMENT COMPANY, OF NEW YORK, N. Y., A CORPORATION OF YORK.

INOANDESGENT LAMP.

Specification of Letters Patent.

Patented Oct. 27, lees.

Toall whom it may concern:

Be it knownthat I, HUGO GERNSBACK, a subject of the Grand Duchy of Luxemburg, and a resident of the city, county, and State of New York, have invented certain new and useful Improvements in Incandescent Lamps, of which the following is a specification.

' Myinvention relates to incandescent elec: tric lamps such as are commonly used for electric lighting, and especially those used for automobiles, boats, etc., where storage batteries are used, and where it is desired to attach an electric lamp in a gaslamp whereby the lamp may be interchangeably gas or electric.

I provide a lamp which is so made that no light is wasted by side reflection when used for autos and the like, and wherein a light of sixteen candle power may be burned from an ordinary storage or chemical battery having a very low voltage. Instead of requiring 106 or 1 10 volts, my improved lamp W111. reduce a' 16 candle lpower light for headlig t urposes, from t e ordinary batteries carrie by automobiles, boats, etc. Heretofore only small lights could be worked from such bata teries, and motorists have been compelled to rely generally on acetylene as a headlight illuminant.

Another result of my improvement is that there are several filaments and oneor more may burn out and the lamps will burn as long as there is one filament remaining. This is highly im ortant in uses for which my lam is adapted? The li ht, it will be understoo is reduced when a ament is burned out, but there will be some light until the last filament burns out. This feature is also important in burning lamps in series. l

My improved lampwhen many are used, may be strung in series or'parallel and are equally adaptedfor both purposes. y In the drawings forming part of this application, Figure 1 is a front elevation of a gas. headlight or'searchlight with my improved electric lamp a plied thereto. Fi 2 is a partial sectiona view of a lamp wit my im-,

provements. Fig. 3 is a perspective view showing the referred form of filament and.

feed wire. 1g. 4 is a similar view showing a slightly different disposition of th e filaments.

Fig; 5 1s a still different form for the filaments. Fig. 6 is a front elevation with parts broken away, making it substantially a sectional of the View. 7 is a section on the line 11-11 of Fig. 6, and Fig. 8 is an inverted plan view lug. The lamp has the usual characteristics of the ordinary incandescent lamp, such as a sealed globe with a vacuum created therein,

and the form of the filaments may be changed without departing from the spirit of the broad claims.

My improved lamp or bulb I have shown attached to an ordinary automobile gas .lamp 1, so as to provide an interchangeable means for using gas or electricity as the illuminant. well known form, is provided with a standard 2 and supporting arms 3 to which the body 5 of the lamp'is pivoted at the point 4. I The pipe 6 through which the gas is usually supplied to the point of combustion, is provided with an end 7 which is exteriorly threaded and the gas tip is usually screwed thereon. In using the lamp as an electric lamp the tip is removed and my improved electric lamp is substituted. This consists of a neck30, which is interiorlythreaded so as to fit the end 7 cf the pipe 6. This neck isipart of a socket 30 in which there is an aperture 27,

through which the electric feed wires 25 and 26 I pass, so as not to interfere with the gas pipe,

and so as to require no fitting except to the independent socket. Secured to the lower portion 30 is a casing 30 which incloses'the seal and connections of the lamp, and at the to is provided with a neck 9 having an insulation 33. Within the casing'is a metal socket 32 formed with a threaded interior in The lamp which may be of any which the corresponding end 12 of anzelec-fl tric lamp is screwed. A set screw 1Lispro vided in the neck 9 which prevents the lamp from working out of its; socket with the continuous 'arring.

I The electric sealing material 34, of plaster or the like, in

which there is a glass seal .14 for the feed wires 15 and 16, The globe 3101 the lamp is fitted in the run of the part 12 so as to be air tight, and it may be of any desired shape.

Running through the glass seal 14 are the supply wires 15 and 16 which are made of platlnum or any of the materials suitable for such urposes, and these are connected at their ower'ends-one'to the part 12 and the other to the end of the lass seal 17 so as to come in eontact with t e connecting plate lamp consists of an interior,

which connects with the wire 26 and which I ranged to burn in parallel; or they may be is secured by a screw 24. There is a similar connecting plate 23 which forms an electrical connection between the wire 25 and the part 12.

In all the forms shown the filaments are to be inclosed in a globe, but for simplicity of illustration the globe is not shown in all views.

In the form shown in Figs. 1, 2, 3, and 6, the feed Wires and 16 extend upwardly into the globe 31 and terminate near the top where they are preferably connected by a stiffening non-conductive bar 20, of glass or other material. A similar connection 19 is provided near the lower part, so that the wires are thus made more rigid without forming an electrical connection. Between the feed wires-I provide a number of fila- 20 ,ments 21 connected to the supply wires at the points 22 and these filaments are adapted v to burn in parallel and simultaneously.

With the filaments arranged in Fig. 3, the light is economical for lamps such as shown 25 in the drawings, where it is desired to throw the light directly ahead. The light is thrown in two directions, forward and backward, the backward being reflected forward by the reflectors, and very little is Wasted by side reflection.

If it is desired, the filaments may be ar ranged in zig-zag' form between the feed Wires, as is sho'wnin Fig. 4, they being ararched 36 as shown in Fig. 5.

The lamps made according to my improvements may themselves be connected on Wires so as to burn in parallel or in series, the

filaments in all cases burning in parallel and simultaneously, as herein described.

A vacuum is created in the lamp when it is sealed and it otherwise has the characteristics of an electric incandescent lamp.

Having described my invention, what I claim is 1. An incandescent electric lamp having a globe, a plurality of-metallic feed vn'res extending into the globe, a plurality of filaments connecting said feed wires and adapted to burn in parallel and simultaneously, and a non-conductive stifiening member connecting the said feed wires.

2. An incandescent electric lamp having a globe, a plurality of metallic feed wires eX- tending into the' globe, a stiffening member of non-conductive material connecting the saidfeed wires and a plurality of filaments connecting the feed wires between the saidstiifening members and .adapted to burn in parallel and simultaneously.

' Signed this 11th day of March, 1907.

HUGO GERNSBACK.

Witnesses:

GEo. I. ARONSON, B. V. MAIrAN. 

